Rear Main Seal

Is it the same as Superformance?
Since I'm not pulling the crank, would I be able to get the block side out again without damaging it if I put it in to check it? Pretty sure my block got align honed. Gonna have to look at the machine shop paperwork. It's been 12 years...
Nervous about getting this right the first time. I'm getting tired of pulling engine and transmission. This is the 5th or 6th time in the last 3 years.

Thanks YR!
I didn`t read all these posts, but I had a r. main leak on my 505 when it was first installed, I ended up making a pair of long studs to hold it straight when titening it down, and used extra black rtv silicone on the main sealing surface, it was not even w/ the block surface.
I tried the trick main seal cap and had no luck w/ it, ended up using the stock one.